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DOI | 10.1175/JAS-D-16-0295.1 |
Multiscale Dynamical Processes Underlying the Wintertime Atlantic Blockings | |
Ma, Jiwang1,2; Liang, X. San3,4 | |
2017-11-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES |
ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2017 |
卷号 | 74期号:11 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China |
英文摘要 | The wintertime atmospheric blocking over the Atlantic is investigated using a newly developed methodology-namely, localized multiscale energy and vorticity analysis (MS-EVA)-and the theory of canonical energy transfer. Through a multiscale window transform (MWT), the atmospheric fields from the ERA-40 data are reconstructed on three-scale ranges or scale windows: basic-flow window, blocking window, and synoptic window. The blocking event is obtained by compositing the wintertime blocking episodes, and a clear westward-retrograding signal is identified on the blocking window. Likewise, the local multiscale energetics following the signal are composited. It is found that a life cycle of the blocking-scale kinetic energy (KE) may be divided into three phases: onset phase, amplification phase, and decay phase. Different phases have different mechanisms in play. In general, pressure work and the canonical transfer from the synoptic eddies initiate the generation of the blocking, while the latter contributes to its amplification. The blocking decays as the system transports the KE away and as it converts the KE into available potential energy (APE) through buoyancy conversion. For the APE on the blocking window, its evolution experiences two maxima and, correspondingly, two phases can be distinguished. In the first maximum phase, the dominating mechanism is baroclinic instability; in the second, buoyancy conversion takes place. These are also the mechanisms that cause the warm core of the blocking in the troposphere. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000417994800017 |
WOS关键词 | OBSERVED ATMOSPHERIC BLOCKING ; NORTHERN-HEMISPHERE BLOCKING ; VORTICITY ANALYSIS ; WAVELET DOMAIN ; PART II ; EDDY ; ENERGETICS ; ENERGY ; FLOW ; MAINTENANCE |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/29206 |
专题 | 地球科学 |
作者单位 | 1.Nanjing Univ Informat Sci & Technol, Sch Atmospher Sci, Nanjing, Jiangsu, Peoples R China; 2.Shandong Meteorol Observ, Jinan, Shandong, Peoples R China; 3.Nanjing Univ Informat Sci & Technol, Sch Marine Sci, Nanjing, Jiangsu, Peoples R China; 4.Nanjing Univ Informat Sci & Technol, Sch Atmospher Sci, Nanjing, Jiangsu, Peoples R China |
推荐引用方式 GB/T 7714 | Ma, Jiwang,Liang, X. San. Multiscale Dynamical Processes Underlying the Wintertime Atlantic Blockings[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2017,74(11). |
APA | Ma, Jiwang,&Liang, X. San.(2017).Multiscale Dynamical Processes Underlying the Wintertime Atlantic Blockings.JOURNAL OF THE ATMOSPHERIC SCIENCES,74(11). |
MLA | Ma, Jiwang,et al."Multiscale Dynamical Processes Underlying the Wintertime Atlantic Blockings".JOURNAL OF THE ATMOSPHERIC SCIENCES 74.11(2017). |
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